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Hence, Galen original: "Gal. lib. 4. de sanit. tuenda cap. 1." calls the sweats of the Icterici those with jaundice πικροχόλους bitter-bile.
If the sanguine or phlegmatic serum does not suffer much from heat, sweet flavors will erupt, or rather they will be ἄποιοι tasteless/insipid.
Acid sweats arise from the mixing of acid humor. Add to this—which has not been noted by others—that serous matter in the veins can contract sourness through boiling. This can also be seen in the sweet juices of fruits, whether they are boiled by the apothecary or the cook.
Sweats that smell good—if they do not receive their odors from food—follow absolute digestion in a very healthy body.
Conversely, where digestion does not proceed, either due to the defect of an unhealthy and unclean body, or due to food, unpleasant sweats emerge. Aristotle, section 13, problem 4, and section 1, problem 48. Hence that statement of Galen, commentary on Aphorisms 26, part 3: "The stench of the excrements," he says, "indicates τὴν ἀπψίαν the absence of digestion/putrefaction."
Thus, the foul sweat of lepers, of those with poor humors, of the scabby, and of those infected with the Spanish disease a reference to syphilis—if especially they have been anointed with mercury, which has not been well deadened by the druggists with sal ammoniac or oil of bitter almonds—is the offspring of τινὸς ἀτιψίας a certain state of indigestion/putrefaction. If anyone wishes to attribute this to the putrefaction of food, as Aristotle does in book 5 of Generation of Animals, chapter 4, and book 4, chapter 8, we do not disagree.
The same must be said of those to whom, because of insatiable heat of the mind, nothing is earlier and more frequent than ὀργᾶν πρὸς τὴν ὀχείαν an urge toward sexual intercourse, to use the words of Aristotle, book 1, Generation of Animals, chapters 14 and 15. For heat is agitated in them, which, spurred by constant lust, also moves the humors, disturbing digestion. This disturbance also happens to boys and virgins when they approach puberty. Hence it happens that they smell like goats.
Rue, onions, garlic, radish, etc., render sweat foul-smelling, according to Galen, book On Attenuating Diet, chapter 1, because their sharpness, mixed into the mass of humors, disturbs digestion and consumes—according to the opinion of Oribasius—the more humid portion that would have tempered the odor. This is also apparent in the pus of those with consumption when thrown upon coals.
The colors of sweats are various, according to the varying mixture of the humors.